curl --request POST \
  --url https://api.coinbase.com/api/v3/brokerage/orders/preview \
  --header 'Content-Type: application/json' \
  --data '{
  "product_id": "<string>",
  "side": "<any>",
  "order_configuration": {
    "market_market_ioc": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "rfq_disabled": true
    },
    "sor_limit_ioc": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "limit_price": "10000.00",
      "rfq_disabled": true
    },
    "limit_limit_gtc": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "limit_price": "10000.00",
      "post_only": false,
      "rfq_disabled": true
    },
    "limit_limit_gtd": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "limit_price": "10000.00",
      "end_time": "2021-05-31T09:59:59.000Z",
      "post_only": false
    },
    "limit_limit_fok": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "limit_price": "10000.00",
      "rfq_disabled": true
    },
    "twap_limit_gtd": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "start_time": "2021-05-31T07:59:59.000Z",
      "end_time": "2021-05-31T09:59:59.000Z",
      "limit_price": "10000.00",
      "number_buckets": "5",
      "bucket_size": "2.00",
      "bucket_duration": "300s"
    },
    "stop_limit_stop_limit_gtc": {
      "base_size": "0.001",
      "limit_price": "10000.00",
      "stop_price": "20000.00",
      "stop_direction": "<any>"
    },
    "stop_limit_stop_limit_gtd": {
      "base_size": "0.001",
      "limit_price": "10000.00",
      "stop_price": "20000.00",
      "end_time": "2021-05-31T09:59:59.000Z",
      "stop_direction": "<any>"
    },
    "trigger_bracket_gtc": {
      "base_size": "0.001",
      "limit_price": "10000.00",
      "stop_trigger_price": "20000.00"
    },
    "trigger_bracket_gtd": {
      "base_size": "0.001",
      "limit_price": "10000.00",
      "stop_trigger_price": "20000.00",
      "end_time": "2021-05-31T09:59:59.000Z"
    }
  },
  "leverage": "2.0",
  "margin_type": "<any>",
  "retail_portfolio_id": "11111111-1111-1111-1111-111111111111",
  "attached_order_configuration": {
    "market_market_ioc": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "rfq_disabled": true
    },
    "sor_limit_ioc": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "limit_price": "10000.00",
      "rfq_disabled": true
    },
    "limit_limit_gtc": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "limit_price": "10000.00",
      "post_only": false,
      "rfq_disabled": true
    },
    "limit_limit_gtd": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "limit_price": "10000.00",
      "end_time": "2021-05-31T09:59:59.000Z",
      "post_only": false
    },
    "limit_limit_fok": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "limit_price": "10000.00",
      "rfq_disabled": true
    },
    "twap_limit_gtd": {
      "quote_size": "10.00",
      "base_size": "0.001",
      "start_time": "2021-05-31T07:59:59.000Z",
      "end_time": "2021-05-31T09:59:59.000Z",
      "limit_price": "10000.00",
      "number_buckets": "5",
      "bucket_size": "2.00",
      "bucket_duration": "300s"
    },
    "stop_limit_stop_limit_gtc": {
      "base_size": "0.001",
      "limit_price": "10000.00",
      "stop_price": "20000.00",
      "stop_direction": "<any>"
    },
    "stop_limit_stop_limit_gtd": {
      "base_size": "0.001",
      "limit_price": "10000.00",
      "stop_price": "20000.00",
      "end_time": "2021-05-31T09:59:59.000Z",
      "stop_direction": "<any>"
    },
    "trigger_bracket_gtc": {
      "base_size": "0.001",
      "limit_price": "10000.00",
      "stop_trigger_price": "20000.00"
    },
    "trigger_bracket_gtd": {
      "base_size": "0.001",
      "limit_price": "10000.00",
      "stop_trigger_price": "20000.00",
      "end_time": "2021-05-31T09:59:59.000Z"
    }
  }
}'

{
  "order_total": "<string>",
  "commission_total": "<string>",
  "errs": [
    "UNKNOWN_PREVIEW_FAILURE_REASON"
  ],
  "warning": [
    "UNKNOWN"
  ],
  "quote_size": "10",
  "base_size": "0.001",
  "best_bid": "<string>",
  "best_ask": "<string>",
  "is_max": true,
  "order_margin_total": "<string>",
  "leverage": "2.0",
  "long_leverage": "<string>",
  "short_leverage": "<string>",
  "slippage": "<string>",
  "preview_id": "<string>",
  "current_liquidation_buffer": "<string>",
  "projected_liquidation_buffer": "<string>",
  "max_leverage": "<string>",
  "pnl_configuration": {
    "trigger_bracket_pnl": {
      "take_profit_pnl": "<string>",
      "stop_loss_pnl": "<string>"
    }
  },
  "twap_bucket_metadata": {
    "bucket_duration": "<string>",
    "bucket_size": "<string>",
    "number_buckets": "<string>"
  },
  "position_notional_limit": "<string>"
}